All-Polymer High-Performance Photodetector through Lamination

All-polymer and semitransparent organic photodetectors (OPDs) fabricated through lamination on flexible substrates are demonstrated. Through lamination both bilayer and bulk heterojunction (BHJ) configurations for two different all-polymer blends are easily made, and characterized in terms of detectivity, linear dynamic range (LDR), and bandwidth. These devices show high detectivity up to 10(11) Jones. The importance of measured noise rather than estimated shot noise in detectivity calculation is discussed and emphasized. With this high detectivity and with the geometric flexibility due to the polymer materials, these detectors can be attached to curved surfaces for optical detection. Their use at fingertips for heart rate sensing is demonstrated. These devices also have a very wide bandwidth of more than 300 kHz and an LDR of 75 dB. As such the, roll-to-roll compatible lamination method shows great potential for high-performance OPDs fabrication.